<%= _.foo %>
outputs foo in the cuurent position of the stash and is the same as
<%= foo %>
<%= .config.url %>
goes to root of parameter stash; like $params->{config}->{url}
<%= ..foo %>
goes one level up in stash
<%= list[3].keyname.method %>
acts like: $stash->[3]->{keyname}->method

<%= __index__ %> the current loop index starting at 0
<%= __counter__ %> the current loop index starting at 1
<%= __first__ %> true if first iteration
<%= __last__ %> true if last iteration
<%= __odd__ %> true if __counter__ is odd
<%= __inner__ %> true if not last or first iteration
<%= __key__ %> the key of an EACH iteration
<%= __value__ %> the value of an EACH iteration
<%= __break__ %> see L<"BREAK"> above
<%= __filename__ %> filename of current template (since 0.91_001)
<%= __filenameshort__ %> short filename of current template (since 0.91_001)